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Non-abelian infra-red cancellations in the unintegrated NLO kernel

By Magdalena Slawinska and Aleksander Kusina


We investigate the infrared singularity structure of Feynman diagrams entering the next-to-leading-order (NLO) DGLAP kernel (non-singlet). We examine cancellations between diagrams for two gluon emission contributing to NLO kernels. We observe the crucial role of color coherence effects in cancellations of infra-red singularities. Numerical calculations are explained using analytical formulas for the singular contributions.Comment: 13 pages, 8 figure

Topics: High Energy Physics - Phenomenology
Year: 2009
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